Initial commit: Voice Assistant Gateway mit Konfig-/Routing-Fundament

- FastAPI-Gateway mit REST-Endpunkten (chat/speak/transcribe/devices/sessions/config)
- Geschichtete Konfiguration mit Profilen (local-dev/hybrid/cloud) via TOML + ENV
- Registry-Pattern + einheitliche Route-Aufloesung (Default->Profil->ENV->Session->Request)
- Device Router (strikt, Singleton) und Output-Lifecycle im Orchestrator
- OpenRouter-Adapter (STT multipart/LLM/TTS) + lokale Provider-Stubs
- Regelbasierte Pipeline (Cleaner/Spoken-Adapter/TTS-Normalizer)
- 22 automatisierte Tests; Doku: README, BEDIENUNGSANLEITUNG, Architektur
- Secrets ausschliesslich ueber Umgebung; .env und lokale config gitignored

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/test_config_profiles.py

@@ -0,0 +1,60 @@
+import pytest
+from pydantic_settings import SettingsConfigDict
+
+from app import config as cfg
+
+EXAMPLE_TOML = str(cfg.BASE_DIR / "config" / "voice-assistant.example.toml")
+
+
+class IsolatedSettings(cfg.Settings):
+    # .env ausblenden, damit nur TOML/Defaults/ENV-Monkeypatch zaehlen.
+    model_config = SettingsConfigDict(env_file=None, case_sensitive=False, extra="ignore")
+
+
+def _clear_provider_env(monkeypatch):
+    for name in ("DEFAULT_STT_PROVIDER", "DEFAULT_LLM_PROVIDER", "DEFAULT_TTS_PROVIDER"):
+        monkeypatch.delenv(name, raising=False)
+    monkeypatch.setenv("VA_CONFIG_FILE", EXAMPLE_TOML)
+
+
+def test_profile_local_dev(monkeypatch):
+    _clear_provider_env(monkeypatch)
+    monkeypatch.setenv("VA_PROFILE", "local-dev")
+    s = IsolatedSettings()
+    assert s.default_stt_provider == "faster-whisper"
+    assert s.default_llm_provider == "local-openai-compatible"
+    assert s.default_tts_provider == "piper"
+
+
+def test_profile_cloud(monkeypatch):
+    _clear_provider_env(monkeypatch)
+    monkeypatch.setenv("VA_PROFILE", "cloud")
+    s = IsolatedSettings()
+    assert s.default_stt_provider == "openrouter"
+    assert s.default_llm_provider == "openrouter"
+    assert s.default_tts_provider == "openrouter"
+
+
+def test_env_overrides_toml(monkeypatch):
+    _clear_provider_env(monkeypatch)
+    monkeypatch.setenv("VA_PROFILE", "local-dev")
+    monkeypatch.setenv("DEFAULT_LLM_PROVIDER", "openrouter")  # ENV gewinnt ueber TOML
+    s = IsolatedSettings()
+    assert s.default_llm_provider == "openrouter"
+    assert s.default_tts_provider == "piper"  # vom Profil, nicht ueberschrieben
+
+
+def test_unknown_profile_raises(monkeypatch):
+    _clear_provider_env(monkeypatch)
+    monkeypatch.setenv("VA_PROFILE", "gibtsnicht")
+    with pytest.raises(ValueError):
+        IsolatedSettings()
+
+
+def test_missing_config_file_falls_back_to_defaults(monkeypatch):
+    for name in ("DEFAULT_STT_PROVIDER", "DEFAULT_LLM_PROVIDER", "DEFAULT_TTS_PROVIDER"):
+        monkeypatch.delenv(name, raising=False)
+    monkeypatch.setenv("VA_CONFIG_FILE", "/nonexistent/voice-assistant.toml")
+    monkeypatch.delenv("VA_PROFILE", raising=False)
+    s = IsolatedSettings()
+    assert s.default_stt_provider == "openrouter"  # eingebauter Field-Default